A Small Aperture Seismo-Acoustic Array, Signal Assessment
Abstract
The Korea Institute of Geology, Mining, and Materials and Southern Methodist University jointly designed, installed, and operated a 1-km aperture four-element seismo-acoustic array northeast of Seoul, Korea. Joint analysis of the seismic and acoustic recordings can be particularly important in identifying and locating industrial blasting sources. Results from this research array are being used to assess the importance of co-located seismic and acoustic sensors and to determine the utility of small aperture arrays for regional monitoring. In the two months analyzed, there were many more acoustic signals than seismic. Approximately 1/4 of all seismic signals is associated with an acoustic arrival and is presumed to be from mining regions. The vast majority of seismo-acoustic observations come from sources in the 30-200 km range in contrast with the shadow zone of no acoustic returns predicted by average atmospheric models. Event location is based upon regional phase identification using the array and back azimuth estimates from both the seismic and acoustic data. Despite the small size of the array, event clusters are identified at regional distances. Waveform comparisons of these clusters indicate that the events are from common source areas. Within the event clusters, there is more event-to-event variation in the acoustic than the seismic signals suggesting the importance of variable atmospheric propagation. The high-Q path of the Korean Peninsula results in regional seismograms that have significant energy to frequencies as high as 16 Hz. The results from this study suggest that small aperture seismo-acoustic arrays such as those similar arrays at Lajitas, Texas (TXAR) and at Mina, Nevada (NVAR) can be important tools in improving.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2000
- Accession Number
- ADA529883
Entities
People
- Brian Stump
- Chris Hayward
- Jeong-soo Jeon
- Myung-soon Jun
- Sara M. House
Organizations
- Southern Methodist University